Display screen or portion thereof with an animated graphical user interface



FIG. 1 is a front view of a first image in a sequence of a display screen or portion thereof with an animated graphical user interface, showing our new design;

FIG. 2 is a second image thereof;

FIG. 3 is a third image thereof;

FIG. 4 is a fourth image thereof;

FIG. 5 is a fifth image thereof;

FIG. 6 is a sixth image thereof; and,

FIG. 7 is a seventh image thereof.

Dashed or broken lines illustrate portions of the display screen or portion thereof with an animated graphical user interface that form no part of the claimed design.

The appearance of the animated graphical user interface sequentially transitions between the images illustrated in FIGS. 1-7. The process or period in which one image transitions to another forms no part of the claimed design. 

CLAIM We claim the ornamental design for a display screen or portion thereof with an animated graphical user interface, as shown and described. 